#!/usr/bin/python

# This is statement is required by the build system to query build info
if __name__ == '__build__':
	raise Exception

'''
Converted to Python 6/00 by Jason Petrone(jp@demonseed.net)


/*
 * Copyright (c) 1993-1997, Silicon Graphics, Inc.
 * ALL RIGHTS RESERVED 
 * Permission to use, copy, modify, and distribute this software for 
 * any purpose and without fee is hereby granted, provided that the above
 * copyright notice appear in all copies and that both the copyright notice
 * and this permission notice appear in supporting documentation, and that 
 * the name of Silicon Graphics, Inc. not be used in advertising
 * or publicity pertaining to distribution of the software without specific,
 * written prior permission. 
 *
 * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
 * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
 * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
 * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
 * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
 * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
 * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
 * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
 * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
 * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
 * 
 * US Government Users Restricted Rights 
 * Use, duplication, or disclosure by the Government is subject to
 * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
 * (c)(1)(ii) of the Rights in Technical Data and Computer Software
 * clause at DFARS 252.227-7013 and/or in similar or successor
 * clauses in the FAR or the DOD or NASA FAR Supplement.
 * Unpublished-- rights reserved under the copyright laws of the
 * United States.  Contractor/manufacturer is Silicon Graphics,
 * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
 *
 * OpenGL(R) is a registered trademark of Silicon Graphics, Inc.
 */

/*
 *  movelight.c
 *  This program demonstrates when to issue lighting and
 *  transformation commands to render a model with a light
 *  which is moved by a modeling transformation (rotate or
 *  translate).  The light position is reset after the modeling
 *  transformation is called.  The eye position does not change.
 *
 *  A sphere is drawn using a grey material characteristic.
 *  A single light source illuminates the object.
 *
 *  Interaction:  pressing the left mouse button alters
 *  the modeling transformation (x rotation) by 30 degrees.
 *  The scene is then redrawn with the light in a new position.
 */

'''

import sys

try:
  from OpenGL.GLUT import *
  from OpenGL.GL import *
  from OpenGL.GLU import *
except:
  print '''
ERROR: PyOpenGL not installed properly.  
        '''
  sys.exit()


spin = 0

#  Initialize material property, light source, lighting model,
#  and depth buffer.
def init():
   glClearColor (0.0, 0.0, 0.0, 0.0)
   glShadeModel (GL_SMOOTH)
   glEnable(GL_LIGHTING)
   glEnable(GL_LIGHT0)
   glEnable(GL_DEPTH_TEST)

#  Here is where the light position is reset after the modeling
#  transformation (glRotated) is called.  This places the
#  light at a new position in world coordinates.  The cube
#  represents the position of the light.
def display():
   position =  [0.0, 0.0, 1.5, 1.0]

   glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
   glPushMatrix ()
   gluLookAt (0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0)

   glPushMatrix ()
   glRotated (spin, 1.0, 0.0, 0.0)
   glLightfv (GL_LIGHT0, GL_POSITION, position)

   glTranslated (0.0, 0.0, 1.5)
   glDisable (GL_LIGHTING)
   glColor3f (0.0, 1.0, 1.0)
   glutWireCube (0.1)
   glEnable (GL_LIGHTING)
   glPopMatrix ()

   glutSolidTorus (0.275, 0.85, 8, 15)
   glPopMatrix ()
   glFlush ()

def reshape (w, h):
   glViewport (0, 0, w, h)
   glMatrixMode (GL_PROJECTION)
   glLoadIdentity()
   gluPerspective(40.0, w/h, 1.0, 20.0)
   glMatrixMode(GL_MODELVIEW)
   glLoadIdentity()

def mouse(button, state, x, y):
   global spin
   if button == GLUT_LEFT_BUTTON and state == GLUT_DOWN:
       spin = (spin + 30) % 360
       glutPostRedisplay()

def keyboard(key, x, y):
   if key == chr(27):
       sys.exit(0)

glutInit(sys.argv)
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB)
glutInitWindowSize (500, 500); 
glutInitWindowPosition(100, 100)
glutCreateWindow("movelight")
init()
glutDisplayFunc(display)
glutReshapeFunc(reshape)
glutMouseFunc(mouse)
glutKeyboardFunc(keyboard)
glutMainLoop()

